linux-kernel - Re: [PATCH 2/3] power/ds2760_battery: make charge_now and charge

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Message-ID: <20100511180551.GA27795@oksana.dev.rtsoft.ru>
Date:	Tue, 11 May 2010 22:05:51 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Daniel Mack <daniel@...aq.de>
Cc:	linux-kernel@...r.kernel.org, Matt Reimer <mreimer@...p.net>,
	Evgeniy Polyakov <zbr@...emap.net>, Tejun Heo <tj@...nel.org>,
	David Woodhouse <dwmw2@...radead.org>,
	Andres Salomon <dilinger@...labora.co.uk>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Len Brown <len.brown@...el.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH 2/3] power/ds2760_battery: make charge_now and
 charge_full writeable

On Tue, May 11, 2010 at 07:28:59PM +0200, Daniel Mack wrote:
[...]
> > 1. Could you at least change this back to
> >    POWER_SUPPLY_PROP_CHARGE_FULL_DESIGN, so it'll be clear what
> >    exactly this prop is actually changing, and
> 
> Do you see any other way to store the actual rated capacity (not the one
> the battery had in its good days) inside the chip?

In that case it should be indeed POWER_SUPPLY_PROP_CHARGE_FULL,
which is full_active_uAh, which we get from di->raw[DS2760_ACTIVE_FULL]
and di->raw[DS2760_ACTIVE_FULL + 1].

We fall back to deriving it from rated_capacity if full_active
is 0 (your case?):

        /* If the full_active_uAh value is not given, fall back to the rated
         * capacity. This is likely to happen when chips are not part of the
         * battery pack and is therefore not bootstrapped. */
        if (di->full_active_uAh == 0)
                di->full_active_uAh = di->rated_capacity / 1000L;

So, you probably want to make DS2760_ACTIVE_FULL writable, not
DS2760_RATED_CAPACITY.

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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